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CVE-2026-89733

HIGHCVSS 7.8/10EPSS 0.16%

Last modified

CVE-2026-89733 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind() In uvc_function_bind() error path, we use usb_ep_free_request which uses uvc->control_req but does not set it to NULL afterwards. Thus, uvc->control_req is a dangling pointer causing a UAF. EPSS estimates a 0.16% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind() In uvc_function_bind() error path, we use usb_ep_free_request which uses uvc->control_req but does not set it to NULL afterwards. Thus, uvc->control_req is a dangling pointer causing a UAF. Also we do not set the uvc->control_buf pointer to NULL after freeing it, which is another dangling pointer. Fix it by setting uvc->control_req to NULL after we run usb_ep_free_request() and uvc->control_buf to NULL after kfree. Do the same for uvc_function_unbind().

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.16%

5.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 0f9df939385527049c8062a099fbfa1479fe7ce0, < ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2; >= 0f9df939385527049c8062a099fbfa1479fe7ce0, < 85dd5e8bd6776d02854f2847d83429f1f712e99c; >= 0f9df939385527049c8062a099fbfa1479fe7ce0, < 502a7f5b79b7ba751988789e982924f8f496129f; >= 0f9df939385527049c8062a099fbfa1479fe7ce0, < bec7708eb3b5295d12e931db24381b7c94c72953; >= 0f9df939385527049c8062a099fbfa1479fe7ce0, < 8e88ed8a374de67270d38689f2a81018909cafbb; >= 0f9df939385527049c8062a099fbfa1479fe7ce0, < 9897b7da8c0ad8356c1b8649379fcb5a689462cb; >= 0f9df939385527049c8062a099fbfa1479fe7ce0, < 38f822ddce9355893d734279a26ddec45182197e; >= 0f9df939385527049c8062a099fbfa1479fe7ce0, < bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc; 1efa8a5aac93d9e67075995d7d4902b57ce184f7; e7a4b0efe62e56a0acc81d16091c6efc2a282be8; 065f5561a20659cf17aae5f72b32b5c2695c8e00; >= 3.2.36, < 3.3; >= 3.4.25, < 3.5; >= 3.7.2, < 3.8
LinuxLinux3.8

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-89733?
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind() In uvc_function_bind() error path, we use usb_ep_free_request which uses uvc->control_req but does not set it to NULL afterwards. Thus, uvc->control_req is a dangling pointer causing a UAF. Also we do not set the uvc->control_buf pointer to NULL after freeing it, which is another dangling pointer. Fix it by setting uvc->control_req to NULL after we run usb_ep_free_request() and uvc->control_buf to NULL after kfree. Do the same for uvc_function_unbind().
How severe is CVE-2026-89733?
CVE-2026-89733 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.16% probability of exploitation in the next 30 days.
How do I fix CVE-2026-89733?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST